Minimum Required Liquid Level; Minimum Back Pressure; Min Flow Required; Temperature Range - Johnson Pump SPX MDR Manuel D'utilisation

MDR
2.2.2
2.3
2.4
2.5
MDR/EN (1206) 3.2

Minimum required liquid level

Minimum required liquid level at the suction nozzle must be more than 3 x the diameter of
the suction pipe.
Figure 3: Minimum required luiquid level.

Minimum back pressure

The MDR-series demands a certain head for good function.
Minimum head = 0,5 m wc or 0,05 bar manometric pressure. If less, install a valve in the
discharge pipe to adjust head.
1
Figure 4: Minimum back pressure (1 = pump).

Min flow required

To cool and lubricate the impeller bearing and shaft a certain flow is required through the
pump.
Min. flow
l/min
MDR45 3
MDR75 5
MDR85 7
MDR105 10
MDR116 10

Temperature range

P2 (PVDF) = -10°C - +100°C
P3 (PP) = -10°C - + 85°C
Technical information
Max. system pressure
bar (20°C)
3
3
3
3
3
11